WaterQualityWatch -- Continuous Real-Time Water Quality of Surface Water in the United States

Real-Time Nitrate, in mg/L as N

Map of , showing which states provide real-time computed water-quality data
05567500 03338780 05554300 05587498 03336890 05553700 05568705 05465500 05420400 03378500 05559900 05543010 05595000 03612600 07020850 03381500 05446500 03339000 05537980 05576100 05576195 05599490 03346500 05447500 05586300 Explanation

* Site operated on a seasonal basis or currently is not operating.
No values are available for the last 6 hours.

The nitrate measurement is actually nitrate plus nitrite. Nitrite absorbs strongly at wavelengths similar to nitrate, and is not explicitly accounted for in the nitrate calculations by the sensors. For practical purposes, the concentration of nitrite is usually negligible in surface waters and has little effect on reported nitrate concentrations.

The "Real-time" map tracks short-term changes (over several hours) of water quality. Although the general appearance of the map changes very little from one hour to the next, individual sites may change rapidly in response to major rain events or to reservoir releases. The data used to produce this map are provisional.